Burglar alarm



Juny 3, w23. mois J. W. LONGWORTH BURGLAR 'ALARM Filed DSC. 8. 1921 42 Sheets-Sheet 1 S35-TIT E B- INVENTOR.

JoHNh/.LomM/@HTH ATTORNEYS' J. W. LONGWORTH- BURGLAR- ALARM .July 3, 1923. 1,166,818

Filed Dec. 8, 1921 2 Sheets-Sheet 2 INVENToR. JOHN w. Loncwon'ru i l. BVB/@WAM :f

ATTORNEYS Patented July 3, l1923. j

"u Ninna sures- PArE-.NT

.T'QHN wQLoneWoRTng; or GRAND nArrns, MIcH'iGAN, Ass'IeNoR' To ABpNjE. y

or HAjsriNGs, MIcHIeAN.

BURGLAR ALARM.

Application iedinecelmbr v8, 192,1. Seriana/520,795.

To allvwhomz't may concern I Be it known that I, JOHN W. .LoNGwonTm a citizen of the United States, residing at Grand Rapids, county of Kent, State of `'Michigan7 have invented certain new-and lation to a door merely by suspending orl hanging upon a door knob, the alarm being actuated by a turning movement of the knob.

Second, to provide an improved burglar'- alarm which is very compact, so that it may be easilyl transported, is quickly Aset'andis positive in operation. l'

Further objects, and objects relating to structural details, will definitely 4appear from the detailed descriptionfto follow. A.

I accomplish theobjects ofmyinvention I by the devices and means described inthe following specification. The invention is clearly defined and pointed out in the claims. Q"

A structure which is a preferredembodiment 'of my invention is clearly illustrated in the accompanying drawing,l forming a part of this application, in which:

Fig. I is a front elevation of my proved burglar alarmv applied toa door, aA

ragment only of the doorbeing shown.

Fig. I I is a vertical sectionof the alarm on a line corresponding todline 2 2v of Figs. I, II and' IV, parts being shown-in full lines' for convenience in illustration. j Fig. III is a vertical section on a line Corresponding to line 3-3 of Figs. II and Fig. IV is a front'view with parts broken away to show structural details. l v Fig. V is a vertical -section onva line corresponding to line 5 5 of Fig. III.

In the drawing similar reference characters referto similar parts throughout the several views vand the `sectional views are taken looking in the direction of thev little arrows at theY ends of the sectionvlines.

rReferring to the drawing, 1 represents a door. 2 a door knob, and 3 a key. These parts are `shown conventionally.

My impro-ved burglar alarm comprises a casing or' housing 4/ open at vthe rear to rethe invention are f ceive ythe knob and lthe .keyof a ldopr.-k

An alarm, designated generallyby the nu` meral 5, is mounted lth'ejfront wall of the casing. Thisalarm is driven from =a' spring 6 Woundby meansof the front portion T f thecasing which is mounted on thesliaft.

This shaft drives atrainofgears, desig-v nated generally by the numeral v9, the train `of gears drivingl the ratchet wheel 10 acti ing upon the paw'l l1 vcarrying'the striker l2. The structural details pf'these parts are yno part of thisinven'tionJ' lThe alarm is controlled jbyl the conftrolfl member 13 pivoted at Maud having a -liigly l5 projecting under the arm 'offtlie striker 12 so that when 4this controll memberfisin locking position the paw'l 11 is lockedfinl en- -gagement with the ratchet l0, therebylocking the alarm, and whenthe controlrmemQ-f ber is in lreleasing position `thisipawl11isf'f75 'freed'sothatthe alarm is sounded.' i

Anactuating rollerl is mounted in the' .upper Vpart of the housing to "coa'ct with` the roller 17 in supporting the housing upon `the knob, that is-,theserollers'rest upon the i knob, as-is'indicated by dottedlinesy inyfFig.` IV. The roller 16 'is provided with a dog '18 adapted'to swing under a' lug 19 on the 'conltrol member and supportthe control mein-' k ber in its locked-position.` `When the roller f16 is actuated, asby the turning of the knob,

the dog passes out from under -this flug 19 allowing the alarm to sound".k l

Toset the roller and the control .member l and also toflock them in set. position while., the' alarm iSv-being handled, as in placingl" upon the knob, I provide a setting a'n'dlock'- ing slide20 mounted inslideways 21 oni-,he side of the housing, so 'thatf the.A slide vis supported at the side ofthe lroller I6. This` slide is provided with a camfslot 22 coact i ing with a pin l23 on the roller,"s`o that when theslide is moved rearwardly `the .roller is positioned to lock the. control member." The slide is also Aprovidedwith. a cam slot .24 co` acting with'the arm 25 onfthe controll memberto rsv'vingit-to locking positionlo'rinto I j coacting relation with the dog 418 on'.,the?y roller.

The slide'has a ifinger-piece'lfZG projecting through a'slot 27 inthe side of the'casing so 'that by moving,` thisV slide rearwardly,

the roller andv the control member yar'eiset and arey lockedfin a set position untilthe of material advantage` in placing the alarm upon a knob las it may be placed upon the knob While locked in set position and then released. A very slight turning of the knob releases the alarm.

A spring 28 is preferably provided in the bottom oi the housing to engage With the key 3.

My improved alarm isV compact so that it may be conveniently carried about and is quickly applied to and removed from the knob las; desired. f v i I have. illustrated and described my improvements in an embodiment which I consider very practical. I have not attempted to-'illustrate various modifications or adaptationswhich I contemplate, as I believe the disclosure made Will enable those skilled in the art to which my invention relates to embody orqadapt the same as .may be desired.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent,is:

lfIn a burglar alarm, the combination of a housing open at the rear to receive adoorknob, an alarm, a pvoted alarm `control member, means for supporting said housing upon a door knob comprising a roller mounted in said housing to be engaged with a knob, a dogon said roller coacting with said alarm control' member for holding it in alarm locking position, a setting and locking slide mounted in said housing at the side of said roller and having'a pair of cam slots, a pin onsaid roller coacting with one of said cam slots, and an arm on said alarm control member coacting With the other of said cam slots so that the roller and the alarm control member are set and retained inset position when the slide is moved `to locking'position.

2. In a burglar alarm, the combination of a housing-adapted to kreceivea door knob,

an alarm, an alarm control member, means for supporting said lhousing .upon-a door knob comprising a roller mounted in said housing to be engaged With a knob, a' dog on said roller coacting With said alarm con-' trol member for 'holdingy said member in alarm locking position, said dog being disengaged by the rotative movement of said roller, asetting and locking member having cam slots therein, a pin on said roller co'- 'acting with one of said cam slots, and an arm on said alarm control member coacting with the other of said camslots so that the *roller and the alarm control member are set and retained inset position. .1

3. In a burglar alarm, the combination with: a housing adapted to receive a door knob, an alarm, va pairk of rollers arranged in said housing to rest upon a door knob, means. for controlling the alarm including 4one oflsaid rollers adapted. tov release the with ahousing adapted to receive a doork knob,an alarm, v a pairlof rollers arranged in said housing to rest upon a door knob, means for controlling the alarm including one of,`

said rollers adapted to release the alarm on the rotative movement of the roller, and means for holding said roller in set position.

5. In a burglar alarm, the combination with a housing adapted to receivea door f knob, an alarm, a pair-of rollers arranged in said housing to rest upon av door knob, means for controlling the alarm includingone of said rollers adapted to release the alarm on the rotative movement of the roller, and a spring mounted in said housing to engage the key of a door lockvvhenthe rollers are engaged with the knob ofa lock.

6. In al burglar alarm, the combination with a housing adapted to receive a door knob, an alarm, a pair of rollers arranged in said housing to rest upon adoorknob, means for controlling the alarmincluding one ol said rollers adapted to release the alarmon the rotative movement of the roller.

7. In a burglar alarm, the combination of a housing, an alarm carriedl thereby, means for supporting said housing upon a door knob comprising an actuating roller, an

alarm control member, a dog on said roller coacting with said alarm control member for holding it in alarm locking position, and a setting and locking member adapted to set the alarm control member and bring the dog on the roller into coacting relation thereto. v

8. In a burglar'alarm, the combination ol? a housing, an alarm carried thereby, means for supporting said housing upon Va door knob y comprising an actuating roller, an alarm control member, and a dog on said roller coacting with said alarm control membery forliolding it` in alarm locking position. 9. In a burglar alarm, the combination lWith a housing, an alarm, an alarm control` member, means :for holding said alarm control member in locking position comprising a roller adapted to be engaged With a knob, and means for locking said rollei `in set position. f

l0. In a burglar alarm, the combination with a housing, an alarm, an alarm control member and means for holding said alarm,`

controlmembe'r, in locking position comprising a roller adapted to be'engaged with a knob.

my hand and seal.

In witness whereof, have hereunto set.l 'i 

